Update drupal-config.json (SchemaStore#5138)

Author: clayfreeman

src/schemas/json/drupal-config.json

@@ -43,6 +43,10 @@
           "title": "Whether the value can be empty",
           "type": "boolean"
         },
+        "requiredKey": {
+          "title": "Whether the key is required",
+          "type": "boolean"
+        },
         "class": {
           "title": "The class implementing parsing",
           "type": "string"

src/test/drupal-config/drupal-config.yml

@@ -16,3 +16,11 @@ config_object:
       label: 'Language code'
     _core:
       type: _core_config_info
+
+test_required_key:
+  type: config_object
+  mapping:
+    optional:
+      type: boolean
+      label: 'Optional field'
+      requiredKey: false